Apparatus for electrostatic-magnetic separation.



H. M. SUTTON a. w. l.. a: l.. u STEELE.

Manus ron nwc'rnos'rmo nonno ssrnmol. APPLIOAIIOI FILED DIO. 21,1808.

948,599. Panq nu 8,1910.

l IlllIl-IIIBT l.

` n. u. surtou a w. L. a n. a. s'rnnLn." Arrnnus lrml nnno'rnosu'rw olmo'mxu'nom Arruonxol rmx nun. n. um. 948,599. A `immuun! ren s. 1910.

I IllllI-llll l.

INVENmRs,

Ema fait, Ida/Lm www n.11. s'U'r'roN a w. L. a' n. e. STEELE# PPBITUBFOB BLECTBOBTLTIO IAGNBTIO SEPARATION.

LPPLIOHQI NLBD DBO. 37. 100|.

mennen Feb. s, 1910.

m W m E F W m l u citiaen'a of the United Stat 'Tocllailesait UNiTESTA'rp'rENT OFFICE.

mf l. mi, WALT L. m EDWIN G. STEEL; 0r DALLAS, TEXAS.

i mmm m mll'xnlll'n? BIPABAIIOI.

Alocalisation et lettera Pateat Patented Feb. 8, 19.10.

mtl lied Mlist l?, 1.. .arial le. 84....

concern: Be it known tliat'we, Hzicar M. Sums, Wanrll L. and Enwiu G.Smm., residing at Dallas, in the county of Dal as, State of Texas, haveinvented certain new and useful Improvements in Apparatus t'orvElectrosta ic-Magnetic Separation, of which the following is aspecification, reference being had therein to the accompanying drawing.

This invention relates to an apparatus for separating the particlesof'ja mass, or thc componuita of a nijxture and for separatelycollecting the separated particlea, and the invention consista inproviding means for delivering thel rticles from t e mass in a thin tsheetlike form, and means 1 for subjectingv the particles to the actionof eld into or through which is l i moana for electrically releasing IIn l pannaeii electrostatic charge or convectiv current. l

The invention further consists in providcertain o the rticles from theirailiociation with others uring the operation or separation.

'llie invention also consists in providing means for var ing orregulating the action or condition o the magnetic tiel I The inventionalso consista in providing means for varying or regulating thccondition, charact static wlivta-.tivc'curirnt during the proeem ofseparation.

The invention nlso consists in providing means for varying, rc 'ulutingor changing either the magnetic lic d or the electro stntic chargebefore the prmwn of iaipnrntion in order to adapt tho nppurntim to thetrentlnent of unitcl'inls the clwtricul und 'niagnetic churnctci'iiitimof l. which arc well known.

The a iparatus herein diseloruul is nlso ada ed y nnitahlc incanti toprtalucc viiried con itious of the stutic charge or convective current.in its wave forin ne illuatrntcd hy dia ins hereinafter to bcdescribed.

ther aud further objects and iidvuntn es of the invention will besetforth in thc (cscription, und the novel features of thc invention willlxiJini-ticiilnily pointed out in the claims.

ln the druwingsz-lt'i ure l is n diugrumnintic mprciwntntion oftheappnrntus und its various conimstions nml controlling dcviccs shown inoperative relation to the principnl' elemento;v Fig. 2 is u sidoclevuand notion of the electro-l tion of an interrupter shown in Fig. 1;Figs. 8, 4, 5 and 6 are diagrams illustrating in a conventional mannerthe different wave forms of tin electro stutic convective cui'- rentwhich maybe produced by particular arrangements of ccrtuin elements olfthe npparatus. Fig. 7 is a niodilicd construction of the fpiirtsinvolved in the electrical rclease o thc pnrticles during thc o icrntionof the uppiii'ntus; Fig. 8 is un end e evution of the parts shown iiiFig. 7: Fig. 9 is n front'elevation .of the principal elements of theapparatus shown in Fig. 1 with n modiication of thc intcrruptcr thereinshown; Fig. 10 is sn edge vicw of the interi-opter shown .in Fig. t);Fig. l1 is un enlarged de tail of a portion of the iiiterrupter shown inFigs. 9 and 10; Fig. 12 is u diagram of one wave form produced by theinteri-opter shown in Fi t); Fi 13 is n modified nrran nient.- o theprincipnl elenientsof the mac inc from that -illustrntcd in Fig. 7. Fig.14 is a side clcvntion of thc princi .iil elements shown in Fig. 13 withn ni iiication of the depolarizin shield shown in the latter figure;Fig. -15 i lustrntes the sul stitution of a round electrode for thepointed electrode shown in the other figures of the drawin Fig. 16 isthe wave-form produced b t. e principal elements illustrated in i"ig. 5;Fig. 17 is a sido eleviition of the principal elements of the machineshown in `ig. 1 with en inter l rotntuble dcpolii'rincr or electricalreeascr which is stilistituted for othei forms of suoli elementsillustratcd in the other tigurcs of the drawings,

and Fig. 18 is a diagrammatic rc'preiantntion of thc intcrrupter showniu Fig. 15.

Like numerals indicate like severnl figures of tho driiwin purts in thc.

In the vnrious ti uren of tir: drawings, 1

2 represents un ndjncciit electrode, which in this instunce is acyliui'lermounted for rotation hy means of the belt pulley 3 (Fi Thebeni-ings for suid jouriiuls ure pole pieces 5 of n puir of magnets (iwhich nrc supported in n cross bnr 'I upon a fixed portion or portions 8of the framework of the eppoi-utils. 'lhe uicnns mi connection und 1 onvv 9) ntlixed to one of the-journnls 4 theroo .l l

support ut' said lair T cianprises insulating sleeves ti and washers ttltlirongli which securing liolts ll ure passed. .\t approxi.

nnttely the center ol' thc lair i a third mitg.

'15 iilipitrhted into its various particles. lleneitth the hopper is iishaker pini t7 which is oscillated hy means et the connecting rod 18 andeccentric tti which is driven in any anitahle manner from any nioviihlepart of the ap nirntus. 'lliis sha er pitn performs the iniiry wellknown function of gradually transferring portions of the intim from thehopper to the electrode 2.'

At the front of the hopper there. is itiljnstidily iniaiiitied a shield20 which is nitide of dielectric ,iuateriah such as hard ruhher. Thelower edge ot this shield is pointed and extends parallel with andslightly ahove griictically the entire length of the electrode 2l isanother similar shield pivotally mounted in a pirated iiriii 22 which-is also pivotally connected with niiotlier arm .23 pirotally supportedin the hracket 4 attached tu any tixeil portion oi' the framework of theup niritttts. 'lhis pivotal stipport of the shie il 2l is for thepurposw of rendering it adjustable with relation to the nut iett) andthe electrode .t. Any'otlier we I known ineiins of yadjui-itiihlesupport may he used. 'llie shields 25'. 2n and .'i' nce of similarnniteriiil aiiil similarly mounted for the purpose of adjustment aliilliiive as imc oftlieir functions the conducting ot particles t0lttiptitnte conipnittnenta 28, 29. tltl aiiil 2li. lit hereinafter to hedescribed. 'llie shield 25 dicrs front the remaining shields in thisrespect that its entire tipper surface with the exception of the rearedge near the pointed und of tho sinne. ia covered hy a iiietiillic otother elect rieiil coniliicting plate :l2 which ia eonliected to groundhy the wire 33. With those principal eleinesita of the apparatus in viewthe sotiree of energy and 'the various connections between the sinnewill now he 53 described.

V'llieiiouree of energy for the magnets conipritias it dynamo 34provided with a douhle throw switch 35 for the purpose ot reversing thecurrent from the dynamo to the inagnt. Tite Miatitnce :iti is connectedwith the dynamo for the purpoae of regulating the iitreligth of currentsupplied to the niag neta. The switch and resistance may he connocted inany suitable manner ini they perforni their welt known functions. Iiithis is arranged ali itlyL instance. lines 37 and 3H extend from onolirushof the drnamo to the terminalsl :la and -ltl of the don le switch,while another line -tl extends to terminals 42 aiiil t3 ot' the switch.A The' resistance is connected with 7o the tield magnets hy lines 44aiiil 4I. As tlnui fitr described it will-he seen that a curretit of anydesired strength inayhe imparted to the poles of the nuignets. ainlthuscstiililiali a niiignetiu tleld extending from the pole lli to theelectrode 2, anil ,that said current may he reversed hy o icrating theilonhle switch. 'lhis reversal o) the magnetic tlelil or direction ofthe inagtietic flux through aA f siecilied class of particles relativeto thc 30 e cetro static tlux theretln-oiigh is important.' When apiirticle which is susceptible to niagiietie action is polarized iniletiiiite directions. such piirticle han a plintl and :i minus pole.'lhe electro static chargcd'rom the 85 points iinpinging upon theparticles gives n plus and a minus polarity. lint this latter consistsof static charges upon the surfaces of the particles. ln the treatmentof some classes ot' material it is prefcrahlc that these 9c plus andminus nnignetic polesl should eoiiieiile with the plus aiiil minusstatic charges on` the surfaces of tlic particles as in this inittinerthe attrtictive force ul' the pitt'ticlea for the electriule would heincrea.-cd over 9:, what it woiilil he it' either force were actingnloiie. lt nia' v also lie tlesiralilc to reverse this coiiilitioii andhave the nu'tgnetic force working in opposition to the static dischargeso that the tiiiignetic poles inthe particles would lie reverse to thoseof the static poles. All of this depends upon tlie class of treatmentcci-tain kinds of ores or manpiaiudsinay require when there are otherparticles in thc naiss from which it is not niaawiiirv `er dcsirahle toiiiiike a wparation. lu the treat-l ment of' .voute complex orcs toconcentrate tlicni for prolitalile smelling it is not always. necessaryto se aiiate cach constituent rf the mass hut1 incre ,v those that aredetrimental 110 to smelling. 'llie reversing ul`l the magnetic poleswiittlil not u|iptecinlil lessen the ntf traction of tliitt lclincofpntticlesgtliat are highly siisceptihle to magnetic action and have noappt'eciahledielect ric capacity. while 115 it would all'cct particlesthat would lie equally"susia'ptilile to lioth fortes. i

.46 represents au electro static generator -for the Apnrpoi-:e of suiplying energy to the pointeil elect-riale l. tis to lie iinilerstisid,ot' course. that any usual source ol' energy may lie employed. v

4 7 is an intet'ritpter or pole changer which is arranged to hisect theconnection or conductor wires extending from the source of energy to theelectrode l. Any suitiihle pole changer or interrupt'cr may hc einployedin lieti of that herein shown and described. 'llic ititerriipter 4T,shown in Fig. l con'siats ot' two disks 4:4 and ttl mounted 3.33

l l l giving either :i direct oiint'erruptial char 'e or eoni'i-eiiwcurrent and for inialilying the polaritiesof .said cui-rent so as tosiihjeet iiuiterinl of a charia-ter refpiiriiig siii-h treatuieut to aVcurrent lowing pohiiiities of au equal intensity. and that hv the use ofthe interruptor the duration ol' the active and inactive periods of thecurrent may he varied. und that h v a change in the foi-ni of theterminals of the lines at the interruptor a continuous or a series ofdisruptive discharge or charge iiuiy he applied to the ter liiiiial.These nualilirations in the character of the charge or convectiveeiireiit eniployed toact upon thc material- :irc eonveiitioi'iallyillustrated iii l`igs. 3 and ti. I'ho alternating charge. the wave ofwhich is illustrated in l"i 3 is pi'mlueed hy using the disks adjusteito provide an opening or a series of openings for the passage of thecharge at the instant au opening is oppositl the terminals ol' eitherthe or eoialuctiug wire. whereby hiking the iiiie w t|"ig. 3) to he zeropotential. there is a sudden rise to full potential. the corners u li ofthe aai'e lieiiig slightly rounded. lhe'high potential heiuguniintaiiied along said line o l. and so upon the side the suine inai|itenanee is assured. aiul there is a sudden. positive and direct risc audfall of potential to zero lietii'ecii ein-h line of maintenance ofpotential. 'l'he suddenness of the rise aiul fall ol' potential isereautial to the successful olaration ol' the apparatus. 'lhe curvatureol the wave nt u b is u mattei' which can lie in a measure controlledliv detei'iiiiliiiig tho formation ot' the terminals ol' the wires atthe disks of the interruptor.l 'lien the terminal is pointed ns at hi'on the liuc lil a continuons liriish like convective current isdelit'eied und h v reason of the advancing cial ot' the slot in theinterruptor reaching into tlie outer portion of this hi'ush likedischarge the corner u is more rounded than when receiving thi currentat the disksl from a i'oiiiiil tei'iiiiiial lilac-that shown in Fi r. 2.and the niaiiilenaiiee ot' the polarity a ong the line n--li is followedli a practical drop for a short distance and tli'en a gradual iippronehto zero. as shown hy the dotted line f iii, Fig. 3l so that hut afria-tion ofthe wave is utilized. 'llue sinne action takes place npoiithe side of tho'zcro line.

A charge having the wave line shown in Fig. 4. that is iin interruptedcharge which is i'nodnced by opening the switch 73 thereby preventingthe paaaagl of thc to the electrode l lint conducting to ground at tis,the will pass through the opening in the disk hy line o2, 63 to theelectrode 1 fioni thence to thc electrode Q'and to the ground. ln thisinstance, as in the others the rise of potential is sudden and themaintenance of potential froni ..to b is secured.

Taking ii char 4. hy closing switch 73, Il

switch Tt being ett open conducta ii cliiirge to the interi-opter undthence by hue .63 tothe eleetrixle l and from thence to may he varied asin icated by dotted linea` g in siiid l`ig. i. I

'llic forni of compound wave shown in Fig. ti i'nay he produced by thefollowing connections. The switch 78 is closed thus sliiiiiting the 4-`charge around the interrapter. 'lhc'switi-.h 79 is lcftopcn and theswitch 73 closed thas taking the through the interrupter to the line 63and thence to the electrode l producing what inay be ti-rined apulsating charge or convective ciirrent at and through the electrode 1the interrupted current inipulsing at d d and inactiva at e e. 'l'hcelectrode il may either be grounded or conniafted hack to the generatoras hereinhefore describen.

lt now reiiuiins to describe the functions and operation of thedielectric shields Jineent in the u ipartaus. lt is extremely eail'-nlilo lo facilitato the arrilllgelliciit 0f the pal'- tielesiis-theyfull from the shaker pan to the electrode .2 in n segregated orindividualized condition and this muy be accomplished by simplyinlluencing thcni with a charge of single polarity which is accomplishedby the action of thi; electro static cha from the electrmto i unpiagingthe sliic d which implants a positive charge upon the front o! theshield and along its pointed ed ,which charge induces. that is, producesy induction a charge of opposite polarit upon the opposite side ot saidpointed eige of the shield, which charge in this case is of polaritywhich induces iii the particles a similiir adai'ity to each other undwhich has a tcniieney to .segregate or separate the particles one fromtheother andeause them to fall upon the cleeii'iale in a thin sheet likeaegi'egated forni. 'llie function of the dielectric shield 2l is in iimeasure the saine as th'at of the shield 20'. aiul h v reason of itsrelative position tothe eloctimle 2 the fland the induced ioles producedat its pointed edge serve to re ease the'niost fcchlv attracted r ticlcsupon the electrodo and to cauae t to travel u iwiirdly alon r the shield2l and then to fnl upon the siield 25, aa clearly shown in Fig. l.'lliose )articles in the ma iii netic field und under tie intluenee of te am i formation of the constant convective charge from the pointedelectrode l, the same tpolarities are produced and maintained al ng itsed aa hereinhefore described ao that the arity induced at what is shownto he the lower aide of the shield 25 acts to a'asiat in electricallyreleasing the particles which are the moet feebb' attached to thocylinder electrode at ii point succeeding that of the primary releasejust described. To prevent the existence of this electrical release fromthe ter portion of the upper surface of the ield 25 a metallic or othercondiictin plate 32 is put upon the u "fr surface o said shield and isconn y wire 33 to the ind, oounteracting and ualifyng the eectro staticaction of the eectrode 1 upon the particles aa soon as they come uponraid. plate #12 from which they are delivered into compartment 28aiiiiply y gravity. It will be readily seen that by ad'ustably mountingthe shields the area of e electrode 2 which shall be under the influenceof the action, direct and indirect, of the convective current maintainedfrom the'electrode 1 may be determined.

represents a felt covered roller which contacts with the electrode 2 andmoves in opposition to the movement of the electrode at the point. ofcontact for the purpose of hruiihing otl' the finely adherent matter.This matter may be of a iwdered nature or a constituent of value whichcontinues to adhere.

Various forms of electrically shielding and releasing elements of theapparatus may he substituted for those thus far described.

Itnow remains to describe certain modifications in the form of theelectro static reli'iiaiii means employed in connection with the c ectrostatic and ma etie field. lVe have discovered that an c ectricalreleasing device which ia not ad'ustuble, but relatively fixed inposition wit regard to the combined electro static and magnetic fieldmay hc employed. We have further diwiwerml that in come instances theelectrical releasing device may be formed of a rotating shield, andfurthermore that in come in' stances it may be of other materiatthandielectric. For exam le, hy referring to Fig. 7 it will he noted t atthe electrode 2, magnet 15 and pointed clectrmle. 1 are in t c camerelation with each other as in Fig. l, hut that the electrode 1 isin theforni of a shaft having points projecting therefrom and mounten inbearings 91 and .carrying the belt pulley 92 with the power oonveyinbelt 99., whereby said electrode ia rotatct By rotating the electrodethere occun n pas cago of the mnvcctive current from itii points to theelectrode 2 when the are pointed toward the same, while iii tie oppositepoi-iition no current passim and the electrodo and magnet are shieldedby the rear 'on 94 of the shaft constituting the y ofthe electrode. Thisconx'itruction produces a succession of applicationa of current to theniaterial intermittent with a abutting ott of the current anddepolariaatioii of the particles adhering .toI the electrode 2 withfeeble attachment thua .performing the saine function as do the 'eldii21 22, etc. aliown in Fig. 1. B regulating the rapidity of the rotationothe electrode 1 di erent efecto are produced and the apparatus ia thusadapted .for the treatment of particles having ditlerentcharacteristics.

1n Fig. 13, 05 shows a pulley driving mechanism for regulatiu the speedoLrotatioii of the rotatiii shi d 96 which iii this instance may be oother niatcrial than dielectric as its presence between the electrode 1and cylinder electrode 2 and magnet l5 displacee and ncutralizeo thecharge or convective current delivered by the intcd electrode and thussto the sticking or attaching of the particlea the current from theelectrode 1 intermittently and facilitates the separation from theeloctrode of the more weakly attached particles. The interposition ofthe electric conductin shiieldltttl presents to thle weakly lattachartic an o ite arit to tiat gesied by thenipasnd tliiirefor sei-vea mp3:tract them froml the cylinder electrodo 2 and this by an oppositemethod, proceso and 2K- eration to that of a direct c arge from e inteproducing in euch elemente a similar polarity to that of the electrodeto which they are attached.

ln Fig. 14 the equivalent shield 07 is rotativeiyhiouiited, but ieintended to be moved by hand into didcrent degrcra of inte ition betweenthe electrodo 1 aiid the e ectrode 2, the particular advantage of thisyform of mounting the shield being that it cany be employed to interponeand cut o! more or lese o the brush like convective current passing fromone electrode to the other and this either in the upper portion, centralvoi' lower portion of the mme, or it may be temporari y thrown cnt ofoperation as shown by full linea in Fig. 14.

In the treatment cf come particlea of nietter it has heen found thatcentrifugal force niayvlie utilized with the i-h'ctro atatc and magneticforces employed in thia ap ratus. ln Fig. 17 08 represente a cylindrirarotating dielectric shield which ia interposed between, the electrode 2and the adjustably supported shield 2 having ii ground plato :i2 uponits surface. llero tho particles which become detached from the cylinderelet-.triste hy ,reunion .of their feeble attachment thereto under theaction of the brush like convective' `current from the clectrode l fullupon the rotating dielectric shield (P8 pointed ice tot

iie

iis

charge would follow the pluie 118 on the front aide of thc diak ll'l'carried thereto by the u per iirin 120 and from the plate thruu thebrush 129 and line 123 buck tov the generator at ita" Kole. In otherworde, themitire charge of t e generator ia short circuited back to itfrom the cylinder electrode 2 for an exceedingly brief instant of timewhich would be occu ied in the s sage of the arm 121 from t e contact patc 118. It will be eeen that b tilting the plate 118 on ita pivot ontof tie vertical plane nf the disk, shorter linea of contact of the wiperarma, re rented by dotted linea of contact 196 in ig. 11, would result.

In this invention it ie to lie understood that an electro tatieconvective current from* an electrode havin n sharpened termination'producen an even. w of current to an opposing electrode aauninterruptedly aa that produced by a lvainc current paaiin over aconductor, w iile a rounded electroi e delivers to an oppoiiiteelectrode nitemiittent charges of potential, the interniins'ionedieincanned by the accumulation of a charge o auch pre-nire ns becomes terthan the intervening nir can 'with thnd. The air, which iii simply ndielectric. ia broken down and a spark pussies fronione electrode to theother, momentarily lowering the potential ao that when a alot opening inthediak ia op ioaite one or both of the rounded termina ii a aerien ofdiachar takes plaec in rapid amwiiiion. while i pointed terminala arenaed the trnuafer ot potential takes place with nu eren Ilou' ofconvective current. While a diacliurge of atutie. electricity from usharp point acte npon n dielectric article in ii manner similar to auinterrnptec charge from the rounded elcctrcalc whose iotentials nrechai'ueterianl h v either a rapid rise oi' a ru iid full. oi' both. iiithe potentiiil snpplieil them. we dini'lme momia for running violentllnetnationa in the elnir s delivered lo the minted electrode. 'l'o iliudiiite the fuels i-eiii'ly. the elet-tro stativ eoni'wtive currenttlowing from n sharp pointed eletl trode to one to which the muti-rml'ix fed for aepariition polarirm the dielectric particles strongly 'inthe manner hewtotore descrilml. tluit is. without interruption. 'llu-nis a ditferenee in the' time in which these particles can hc polarized,or in whirl: this von. slant dillerenee of tentinl can he nel up iindmaintained. hercfore by regulating the tina` an well im the charneterofthe elmrue given from the pointed electrode one Het of piirtielm cnnla' ditlorentiuted from the rest by the fazit' tlnit ih the time inwhich the eluirge in given one Het is |iolariaed while. the other ianot. The rounded terminnla do the same with intermittent chui-grs, with.however, Illia dillcrenie: thel longer the time of the elmrge delivered,the lest: Awill lifi.l lho l polarization owing te the fact that theparticleii acquire the naine potential na the electrode and would horepellcd.

accurately timed so tlnit the particles will never become fully eliurV.l thun maintaining them at a constant diiircnce of potential from thatof the couveeer electrode to pie ventl repulsion. 0n t other hand, thelonger the duration of charge from the pointed electrode the 'greaterwill be the ariaation of the particles up to the maximum of their cacity, but never reaching a repqellmg potential. .f

c ime of the features of conatruction herein described are ahown anddeaeribed in ,our application Serial No. 995,802, tlled September 24,1004 and claimedltherein.

'Having desicribiwl our invention and set forth itainerita, what weclaim and deaire to secure by Letters Patent is:-

1. ln au electro static magnetic ae ratoi, means for producing amagnetic fieli means for subjecting the particlea of a mail to theaction of a static elia dated to produce and maintain dielectricpolarity on annie of the particles opposite to that of one electrodewhile' in eaid ma tic eld and means for neparately col ecting theseperated particles.

1n .m electro atatic magnetic ne lucana for piiahleinga magnetic elmeans.- for feeding nnitei'iiil thereto, means for pro during undmuintuining dierenee of potentiul between mme particles of nialeriui lndone elven-mh while said particles are in Suid magnetic tield nml uieansfor aepxirntely collecting the epurnted purtii-lea. y

3. ln un electro stntii' nmgnetie se iarntor, means foipiodm'in v umagnetic iieli` means for feeding materia thereto. menne for producingund maintaining ditl'vrenee of potenlinl between come purl ielea ofmnterial and one electrode' while in .unid nia nctu l'ielil, menusloented niljnrent tovsnid e ertrode for unlawqnently de|mlurizin v aaidparticles and menne: for seinii'utely eolreeting theseparated purlii'les.

4. ln iin electro etiitie magnetic eeparator, meiina for feedingeounnnmtnl material, moana fer delivering to the particles of a mam aninterrupted static cha of one polarity while in a magnetic tiel andmeans foi; ae|mi1itely eolleeting the' separated partie es.

5. ln nn elc'flro static magnetic aparato?, meiiim for fecalin umm whilein ainagnetic field an interruptfyingg the strength of aai( charge andmean! e for sepurutely collecting the separated partii'leH.

1'. ln un eliamutntioniaignetic mpmi'emr,

Therefore, with rounded electrodes the charite mult be.

uns

commiuti'ted material, meuna for delivering to the particle of a edelnirge of one polarit means for modil al field of the apparatus.

, means for feeding coinminuted material, means for subjecting theparticles of the material to a magnetic field, electro static means forpolarizing the particles, means for interrupting the direct action oftlie electro static means for eiectrically releasing some of theparticles aiid means for separately cullecting'the separated particles.

'a'. 'ln an electro static magnetic separator,

means for feeding cominiiiiited material,

means for subjecting the particles to theactioii of a magnetic tield,means for sabjectiug them w iile insanl field to either a static chargeof one-polarity which is conll tiiinoua, or to a static charge ofalternating polarity and means for separately collecting the se ratedparticles.

8. n an electro static magnetic separator, means for producin an electrostatic magt netic eld, means or retaining a masa of particles andfeeding the same to said field, ainl inter sed means between 'theretaining means a field for shielding the mass from the influence of theelectro static magnetic t). In an'electro static magneticl separator,means for producing an clectio static niaglietic field, a lmp r, ashaker pun, and means for electrica ly shielding the hopper Se and panfrom said field. l0. In an electro static magnetic sepal'atoi', electrostatic electrmles, an interlmseal ma iet, n a hup ier, ainl an electrostatic abied between t magnet and the hopper.

l1. In an.electro static magnetic separator, electro static eli-ethnies,an interpwied magnet, and an electro static shield ingerpnsed betweenthe magnet and the electrmles.

lit. In an electro static magnetic sepa- 40 rator. electro staticelectrodes, an interposed magnet, and electro static shields interposedbetween the electi'iales and the magnet above and below the plane of thccharging ,electrode.

13. In an electro static magnetic separator. a charging electrode. aseparating electrode, a magnctco ratively arranged, and ,means forelectrical ticles from the first mentioned electrode.

l-t. ln' van electro static magnetic separator, a charging 'elet-tronic,a se rating electrode. a magnet co ierativ y: arranged means forelectrically iicldini-Ia iportionof one el'ectrtale from t ie aetion'tereon of the other electrode to elect rically'rrlearae tho pan ticlesfrom the first mentioned electrode. and L means for snlmpicntlyelectricalIyishiclding l flic released particles from tlie remainderthereof.

1'5. ln an chctrostatic magnetic separasliieldi v a portion oflv oneelectrode from t ieaction t iereon of the I0 other electrodetoelectriwlly release thc par- ,netic field in the region of aait trode,a magnet cm'ipeiativcly arranged.

means for electricallv shielding a portion of one electrode from tlieaction thereon of tlnotlicr electrode to electrically release theparticles from tlie iii-st inentioncd elcctrode. means for subsequentlyelectrically shielding tbe released particles from the remainderthereof, and means for subsequently redneiiig said released particles tozero potential.

ttl. In an electro static magneticse iarator, a charging electrode, aseparatin efectrmle, aiid means for electrically shiel in bodies ofseparated particles from each ot er and from said electmdes.

17. In an electro static magnetic separator, a cliar ing electrode, a senirating elec# trade, an eectrical shield of ielectric inaterial, andmeans for restricting polarity to a portion of said shield.

18. In an electro static magnetic separator, means forfeeding'comiuinuted mateiial, means for subjecting the particles to theaction of a regulated varied static charge, means for simultaneouslyproducing a magnetic field in which saidparticles are statically acted uion and means for separately collectingt ie separated particles. y

19. In ah electro static magnetic separator, means for feedingcomminuted material, means for subjecting the particles to the action ofa convective discharge while in a magnetic field, means for producingthe magnetic field, means for varying the strength 'of said magneticfield and meansfor separately collecting the separated particles.

. 20. ln a separator of the'clusa described, matins for feedingcomnii'nuted materia'l,

means for producing a magnetic field, means f for producing anelectrostatic field, means for varying the strength of the magnetictield, means for varying the strength of one polarit of the staticcharges operating in said fie d and means for separately collecting .theseparated particles.

2l. n 'a separator of the clam described, means' foi' feeding comminutedmaterial, means for subjecting the particles to the action of, atainvcctivcly, delivered charge, means for simultaneously producin amagcharge, nica'ls for reversing thc polarity of the magnetic field andmeans for separately collect- -ing the separated particles.

22. ln ii `separator of the class described, means for feedingcomminiited material, means for subjcctin articles to the action of amnvectively yi elivercd charge, means .for simultaneously producing nmagnetic field in the region of said charge, munis for changing theYpolarity of the convective charge and inciiiis for separately collectingtor, a charging clectrmlc, a separating elccthe separated particles.

IIB

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